US-20260128639-A1 - VEHICULAR DRIVE DEVICE

US20260128639A1US 20260128639 A1US20260128639 A1US 20260128639A1US-20260128639-A1

Abstract

A vehicular drive device includes a rotating electrical machine, a case that houses the rotating electrical machine, and a channel forming member between an outer peripheral surface of the rotating electrical machine and an inner peripheral surface of the case, and forming a refrigerant channel through which a refrigerant passes, in which the channel forming member has a cylindrical shape and has one end side in an axial direction fastened to the case, and in a case where a rectangle circumscribing an outer shape of the rotating electrical machine and having two sides parallel to an up-down direction as viewed in an axial direction, each of fastening parts of the channel forming member with respect to the case overlaps at least one corner of four corners of the rectangle as viewed in an axial direction.

Inventors

Noriaki Sugimoto
Shunya KAWADE
Tatsuro SUWA
Tomoyuki Suzuki

Assignees

AISIN CORPORATION

Dates

Publication Date: 20260507
Application Date: 20230927
Priority Date: 20221007

Claims (8)

1 . A vehicular drive device comprising: a rotating electrical machine; a case that houses the rotating electrical machine; and a channel forming member disposed between an outer peripheral surface of the rotating electrical machine and an inner peripheral surface of the case, and forming a refrigerant channel through which a refrigerant passes, wherein the channel forming member has a cylindrical shape and has one end side in an axial direction fastened to the case, and in a case where a rectangle circumscribing an outer shape of the rotating electrical machine and having two sides parallel to an up-down direction as viewed in an axial direction, each of fastening parts of the channel forming member with respect to the case overlaps at least one corner of four corners of the rectangle as viewed in an axial direction.
2 . The vehicular drive device according to claim 1 , further comprising a wiring connector of an electronic component provided in association with the rotating electrical machine, wherein the wiring connector overlaps the at least one corner as viewed in an axial direction.
3 . The vehicular drive device according to claim 1 , further comprising a transmission mechanism that transmits drive force from the rotating electrical machine to a wheel via a shaft member, wherein an axial center of the shaft member is parallel to an axial center of the rotating electrical machine, and offsets to one side of one direction intersecting in an axial direction, and the at least one corner includes a corner on an upper side and on another side of the one direction.
4 . The vehicular drive device according to claim 3 , wherein the fastening parts are provided at three or more points, and two of the three or more fastening parts are disposed on two corners on another side of the one direction, among the four corners.
5 . The vehicular drive device according to claim 3 , wherein the case further houses the transmission mechanism and includes a catch tank that catches oil scraped up by rotation of a gear of the transmission mechanism, and the catch tank overlaps the at least one corner as viewed in an axial direction.
6 . The vehicular drive device according to claim 2 , further comprising a transmission mechanism that transmits drive force from the rotating electrical machine to a wheel via a shaft member, wherein an axial center of the shaft member is parallel to an axial center of the rotating electrical machine, and offsets to one side of one direction intersecting in an axial direction, and the at least one corner includes a corner on an upper side and on another side of the one direction.
7 . The vehicular drive device according to claim 6 , wherein the fastening parts are provided at three or more points, and two of the three or more fastening parts are disposed on two corners on another side of the one direction, among the four corners.
8 . The vehicular drive device according to claim 6 , wherein the case further houses the transmission mechanism and includes a catch tank that catches oil scraped up by rotation of a gear of the transmission mechanism, and the catch tank overlaps the at least one corner as viewed in an axial direction.

Description

TECHNICAL FIELD The present disclosure relates to a vehicular drive device. BACKGROUND ART A technique is known in which a channel forming member forming a refrigerant channel (cooling water passage) around a rotating electrical machine is fastened to a case (outer case) paired with the channel forming member (inner case). CITATIONS LIST Patent Literature Patent Literature 1: US 2020/0235640 A SUMMARY OF DISCLOSURE Technical Problems However, in a conventional technique as described above, it is difficult to fasten the rotating electrical machine to the case together with the channel forming member without significantly increasing a size of a vehicular drive device. Accordingly, in one aspect, the present disclosure intends to fasten a rotating electrical machine to a case together with a channel forming member without significantly increasing a size of a vehicular drive device. Solutions to Problems In one aspect, there is provided a vehicular drive device including a rotating electrical machine, a case that houses the rotating electrical machine, and a channel forming member disposed between an outer peripheral surface of the rotating electrical machine and an inner peripheral surface of the case, and forming a refrigerant channel through which a refrigerant passes, in which the channel forming member has a cylindrical shape and has one end side in an axial direction fastened to the case, and in a case where a rectangle circumscribing an outer shape of the rotating electrical machine and having two sides parallel to an up-down direction as viewed in an axial direction, each of fastening parts of the channel forming member with respect to the case overlaps at least one corner of four corners of the rectangle as viewed in an axial direction. Advantageous Effects of Disclosure In one aspect, according to the present disclosure, it is possible to fasten the rotating electrical machine to the case together with the channel forming member without significantly increasing a size of the vehicular drive device. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic top view showing a state of a vehicular drive device mounted on a vehicle. FIG. 2 is a cross-sectional view of the vehicular drive device. FIG. 2A is a skeleton diagram showing the vehicular drive device. FIG. 3 is a side view schematically showing the vehicular drive device according to the present embodiment. FIG. 4 is a perspective view of a channel forming member. FIG. 4A is an enlarged view of a portion Q4 in FIG. 4. FIG. 5 is a schematic view of a refrigerant channel formed by the channel forming member. FIG. 6A is a cross-sectional view of a portion of the refrigerant channel. FIG. 6B is a side view schematically showing a positional relationship among a first output member, a refrigerant supply unit, and a refrigerant discharge unit. FIG. 6C is an enlarged view of a portion Q6 in FIG. 2. FIG. 7 is an explanatory view of preferable arrangement of fastening parts, and is a side view schematically showing the vehicular drive device according to the present embodiment. FIG. 7A is a view schematically showing arrangement of a part of the fastening parts according to a comparative example, by superimposing the part with dotted lines on the drawing in FIG. 7. FIG. 8 is an explanatory view of preferable arrangement of the fastening parts, and is a side view schematically showing a relation with a wiring connector. FIG. 9 is a side view from an A2 side, schematically showing the vehicular drive device according to the present embodiment. DESCRIPTION OF EMBODIMENTS Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings. Note that dimension ratios in the drawings are merely examples and are not limited thereto, and shapes and the like in the drawings may be partially exaggerated for convenience of description. In the following description, a Y direction (refer to FIG. 3 and the like) correspond to an up-down direction in a state where a vehicular drive device 100 is in use, that is, an up-down direction with respect to an orientation in which the vehicular drive device 100 in use is disposed. Then, a Y1 side and a Y2 side correspond to an upper side and a lower side along the Y direction. Note that the up-down direction is not necessarily parallel to a vertical direction, and it is only required that a vertical direction component is predominant. Furthermore, in a case where the up-down direction when the vehicular drive device 100 is in use is significantly greatly inclined with respect to the vertical direction, the up-down direction in the following description may be interpreted as an up-down direction when the vehicular drive device 100 as a single unit (product) is placed on a flat surface (a similar applies to a case of a horizontal direction). Furthermore, orientations of respective members in the following description represent orientations in a state where the respective members are fitted to the vehicul